The fracture toughness of cemented carbide is also known as the coefficient
of saturation (Kic), which is used as an index to measure the energy and impact
load that must be used for the damage of cemented carbide.
The testing method is to make the sample crack and fracture by external
force, and the energy value from crack propagation to fracture is the fracture
toughness. Fracture toughness represents flexibility, the larger the value, the
more difficult to expand the crack.
The fracture toughness increases with the increase of cobalt content and
decreases with the decrease of the particle size of tungsten carbide.
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